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The globular cluster M15 from Thézac (dept. 17, France) on 24/08/2016 Guiding: off-axis guider on C8 telescope at F=2000mm, LodeStar StarLight Xpress Telescope: C8 at F=2000mm Mount: SkyWatcher EQ6 Imager: Atik 314L+ at -7.5°C Moon: 63% visible Conditions: 22°C, dry air Exposures: L:4x120s bin1 R:2x120s bin2 G:2x120s bin2 B:2x120s bin2 Offsets: 15x0.001s in bin1 and 15x0.001s in bin2 Darks: 11x120s in bin1, 11x120s in bin2 flats: L:15x0.035s R:15x0.7s G:15x0.053s B:15x0.028s Ha:11x15s Processing: IRIS then GIMP: curves. Commentary: I may need to improve the focus and guiding.
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